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2. Onboard refueling vapor recovery - Wikipedia

   en.wikipedia.org/wiki/Onboard_refueling_vapor...

   The purge valve controls the purge vapor purge line, through which the manifold vacuum pulls air through the vapor storage device and purges it of fuel vapors. The electronic control unit (ECU) controls the opening and closing of this valve. [8] [dead link ‍]

3. Crankcase ventilation system - Wikipedia

   en.wikipedia.org/wiki/Crankcase_ventilation_system

   The crankcase air outlet, where the PCV valve is located, is generally placed as far as possible from the crankcase breather. For example, the breather and outlet are frequently on opposite valve covers on a V engine, or on opposite ends of the valve cover on an inline engine. The PCV valve is often, but not always, placed at the valve cover ...

4. Exhaust heat recovery system - Wikipedia

   en.wikipedia.org/wiki/Exhaust_heat_recovery_system

   The WFHRS is designed for a variety of different applications, both fixed and variable RPM, aftermarket and OEM applications, but generally geared toward larger equipment such as large on-highway trucks, diesel generators, large buses and motor-homes, marine vessels, medium duty trucks, etc. [9]

5. Diesel particulate filter - Wikipedia

   en.wikipedia.org/wiki/Diesel_particulate_filter

   Cordierite Diesel Particulate Filter on GM 7.8 Isuzu. Unlike a catalytic converter which is a flow-through device, a DPF retains bigger exhaust gas particles by forcing the gas to flow through the filter material before exiting; [2] [29] however, the DPF does not retain small particles.

6. Nitrous oxide engine - Wikipedia

   en.wikipedia.org/wiki/Nitrous_oxide_engine

   A separate electrically operated valve is used to release air and gaseous nitrous oxide trapped in the delivery system. This brings liquid nitrous oxide all the way up through the plumbing from the storage tank to the solenoid valve or valves that will release it into the engine's intake tract. When the purge system is activated, one or more ...

7. Manifold vacuum - Wikipedia

   en.wikipedia.org/wiki/Manifold_vacuum

   Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere.. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intervening carburetor or throttle body leading to the intake manifold.